/*
 * This is Melet, a salary slip designer. Feed it with data regarding to salary payment, prepare it for print through the graphical presentation, and you have it done.
 * Copyright (C) 2014, AFDiaX
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * This program is based on UMLet, a Free UML Tool for Fast UML Diagrams.
 * To contact the authors of UMLet visit https://code.google.com/p/umlet/people/list
 * To contact the authors of Melet visit https://gna.org/users/gabocze
 */
package com.baselet.gui.standalone;

import java.awt.AWTEvent;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;

import javax.swing.JComboBox;

import com.baselet.diagram.CurrentDiagram;
import com.baselet.gui.CurrentGui;

public class ZoomListener implements ActionListener, MouseWheelListener {

	@Override
	public void actionPerformed(ActionEvent e) {
		handleEvent(e);
	}

	@Override
	public void mouseWheelMoved(MouseWheelEvent e) {
		handleEvent(e);
	}

	private void handleEvent(AWTEvent e) {
		if (CurrentGui.getInstance().getGui() instanceof StandaloneGUI && CurrentDiagram.getInstance().getDiagramHandler() != null) {
			// The offset is -1 (wheel up) or +1 (wheel down) or 0 (no wheel used)
			int offset = 0;
			if (e instanceof MouseWheelEvent) {
				offset = ((MouseWheelEvent) e).getWheelRotation();
			}

			String zoomFactor = ((JComboBox) e.getSource()).getSelectedItem().toString();
			zoomFactor = zoomFactor.substring(0, zoomFactor.length() - 2); // Cut the zoomvalue eg: "120%" to "12"
			int newZoomFactor = Integer.parseInt(zoomFactor) + offset;

			if (newZoomFactor > 0 && newZoomFactor < 21) {
				CurrentDiagram.getInstance().getDiagramHandler().setGridAndZoom(newZoomFactor);
			}
		}
	}
}
